Gas akd aib mixer



(No Model.) 3 Sheets-Sheet 1.

E. ME-RBDITH.

GAS AND AIR MIXER, No. 447,784. Patented Mar. 10, 1891.

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(No Model.)

E. MEREDITH.

GAS AND AIB. MIXER.

No. 447,784.` Patented Mar. 10, 1891.

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(No Model.) 3 Sheets-'Sheet'. 3

E. MEREDITH.

GAS AND AIR MIXER.

No. 447,784'. Patented Mar. 1o, 1891.

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UNITED STATES PATENT OFFICEg EDMUND MEREDITII, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE PENNSYLVANIA GLOBE GAS LIGHT COMPANY, OF SAME PLACE.

GAS AND AIR MIXER.

SPECIFICATION forming part of Letters Patent No. 447,784, dated March 10, 1891.

Application filed November 26, 1890. Serial No. 272,656.` (No model.)

T w77 whom, it may concern,.-

Be it known that I, EDMUND MEREDITH, a citizen of the United States, residing atPhiladelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement in Air and Gas Mixers, of which the following is a full, clear, and exact description.

The object of this invention is to provide a ro device for mixing air and gas to be supplied to burners, the apparatus being a portion of a carburetor plant.

The invention consists of a mixer having a vertically rising and falling holder arranged therein with a proper seal, the said holder being connected with and operating a lever, which in turn is connected with the peculiar valve mechanism of this invention, as will presently appear, whereby as the mixed air zo and gas enter the holder the said holder is raised and when it reaches its highest position automatically closes the valves and shuts off the supply of air and gas. Then the holder descends (as the gas is consumed) and z5 reaches its lowermost position, the valves are automatically opened to admit a fresh supply of air and gas, all as I will proceed now more particularly to set forth and finally claim.

lIn the accompanying drawings, illustrating my invention, in the several figures of which like parts are similarly designated, Figure l is a sectional elevation of the complete apparatus, showing the holder in its lowermost po- 3 5 sition and the valves open. Fig. 2 is avertical section of the Valves in the position they occupy'when the holder is in the position indicated in Eig. l. Fig. 3 is a view similar to Fig. l, but showing the holder in its highest position and the valves closed to cut off the supply of air and gas. Fig. 4 is a plan view of the air-inlet cock and its attached indicator. Fig. 5 is afront elevation of the valve mechanism, partly in section, with the parts in the position shown in Fig. l. Fig. 6 is a vertical section taken in the plane of line me, Fig. 5. Fig. 7 is a plan view of the valverocking lever.

The mixer a has a bottom chamber divided 5o -into the inlet-compartment a and outlet-compartment a2 by means of a partition a3. a4

ing motion therein.

the admission of air and gas.

is the inlet-channel, a5 the induction-tube extending from the compartment a and rising above the seal, and a6 is the eduction-tube ,f opening into the compartment a2, and a7 is 55 the nipple for connection of the distributingpipe. v b is the holder provided with a guidingsleeve 7)', arranged upon a guide-rod b2, suitably supported and steadied within the mixer 6o a. The holder b is connected by a link b3 with a lever c arranged upon a rock-shaft c, having bearings in a cap as.

The rock-shaft c is provided with a forked arm c7. This forked arm operates in conj unction with a crank e, preferably provided with an anti-friction roller e', which said crank e is fixed, as by a set-screw e2, to one end of a shaft f. This shaft f is journaled in a frame' g, and it carries a four-armed lever 71,. One 7o arm h of this lever is provided with a pin hX, which is engaged by the forked end of a piston 1,', and the said piston is arranged within a case i', journaled on gudgeons i2 in the frame g, so as to be capable of receiving a rock- The piston is provided with a collar i3, against which abuts a spring 4, the other end of the said spring abutting against a nut 5, tapped in the end of the casing vl', whereby the tension of the spring may 8obe adjusted to provide for placing the proper burden upon the lever 71 for a purpose presently appearing. The lever 71, is provided, also, with the arms h2 and 7a3, in line with one another, and with a fourth arm 71.4, arranged 8 5 substantially at right angles to, or, in other words, projecting laterally from, the arm h2. The arms h2, 7e3, and 7# are provided with take-up devices, each consisting, substantially as shown, of a flat piece of spring metal h5 9o and an adj listing-screw h6. This rocking lever 7L co-operates with the arm j, made fast to the shaft j. This arm j projects on each side of the shaft j and terminates in antifriction rollers y2, with which the arms 7b2 and 95 h3 alternately come in contact to rock the shaft j. This shaft j is provided with a toe 7o, engaging tappets Z 7 on the valve-stem Z', to raise and lower said valve-stem as the arm j is actuated by the lever 7L. The valve-steml roo has the puppet-valves Z2 Z3, which provide for The valve 72 has a seat l4 at the top of a perforated annular chamber Zi", communicating with the gasinlet l, and the valve Z has a seat ZT in a wall or septum in the air-chamber ZS. The valvestem Z has a bottom guide l, and has a top guide ZIO, the latter consisting, as shown, of a screw tapped into the nut m, which serves as the upper closure for the valve case or shell m. A cushion ma, of rubber or other soft stuff, is placed in the nut m, and held therein by the screw Zw to prevent undue jarring of the valves as they. are lifted by the toe 7.1.

The shaft j is provided with an arm n, on which is arranged a weight n. This arm is forked at its rear end and provided with a icross-pin n2. A latch o is pivoted to the frame g, and has an offset or shoulder o to engage the pin n2 to lock the valves (when the holder has risen to its highest position and thereby closed the valves) to hold said valves from opening until the holder has descended sufficiently to open the valves positively. A spring o`2 serves to hold the latch o in such engagement.

A tripping device p is pivoted at p to the frame g, and one end projects into the path of movement of the laterally-projecting arm h4 of the lever h, while its other end extends rearwardly into the line of movement of the latch o.

In order further to cushion the valves and t their tripping mechanism, I have connected with the arm '7' a dash-pot q. The piston q of this dash-pot has a longitudinally-perforated stem q2, and this longitudinal perforation is intersected by a lateral opening qi, the size of which is controlled by a screwvalve q1. The hood rf is placed over this opening g3. The dash-pot, by preference, is supplied with glycerine. As the piston descends, air escapes through the opening g3, gradually or with difficulty, according to the extent of opening allotted by means of the adjustment of the screw g4, and as the piston ascends the partial vacuum formed thereby sucks in the air through the opening qs.

I provide the valve r in the air-inlet with an indicator-plate fr', having suitable marks to show, for example, that the valve is wide open, partly open, or entirely closed, and I provide the operating-handle r? of this valve with a pointer r3 to cooperate with the indicator-plate r.

The operation is as follows: As the holder is emptying it will by gravity fall into the position indicated in Fig. l, and in so doing will cause the valves to open and the valveoperating mechanism to take the several positions indicated in Fig. l. As the holder rises it rocks the arm d, and as said holder attains about a third of the distance of its elevation the said arm d comes in contact with the anti-friction roller c of the crank c and begins to move the said crank, the lever h, and the spring-plunger if, the direction of movement of J[he said crank c being indicated by the arrow in Fig. 0. As the holder continues to rise and the parts move, the crank e and plunger fi will pass a vertical line in opposite directions, and the pressure of the spring Ii* will be sutlicient, after such vertical line has been passed, to act upon the arm 7L and shift the lever 7L from the position shown in Figs. l, 5, and G to that shown in Fig. rlhe valves will then be closed and the supply of air and gas eut olf, and then as the gas is consumed theholder will descend and a reverse operation of the parts will take place. The air coming in through the cock "r and the gas coming in through the inlet Z will mingle in the annular chamber Z5 and pass thence through thc seat ZL out at the opening s into the channel a4, and thence into the compartm ent a through the tube a into the holder. As the holder is completing its descent and the lever 7L has been tripped, its lateral arm 7L" will move the tripping device p to disengage the latch o from the pin 'a2 to allow the operation of the shaft j. I provide this latch 0 to insure the closed position of the valves until just before the holder has completed its descent. lVere it not for this latch the jarring caused by street-travcl and otherwise produced would have a tendency to influence the movement of the valves at improper times; but with this latch the proper position of the valves is always insured. \Veighting the arm n insures the rocking of the shaftj'l when said arm has been released.

lVhenever it becomes necessary, as by wear or otherwise, to bring the arms h2, h3, and 7L" into closer contact with the parts with which they co-operate, the screws hU maybe turned down, so as to throw the springs h5 farther from the arms h2, h3, and 71.", and thus nearer to the anti-friction devices j? and ja and the tripping device p.

lVhat I claim is" 1. In a mixer, an outer casing and a holder arranged therein, valves for controlling the admission of air and gas to said holder, a tripping mechanism interposed between the said holder and valves and operated by the rise and fall of the holder, and comprising a rock-shaft connected with the stem of the valves, a rock lever or arm for moving said shaft, a spring plunger or piston for holding the said rock lever or arm in given position, a crank connected with the pivot or shaft of the said rock lever or arm, and an arm cooperating with said crank and actuated by a rod connected with and moved by the holder, substantially as described.

2. In an air and gas mixer, a holder and puppet-valves interposed between the air and gas inlets and in an air and gas mixing chamber and controlling the admission of mixed air and gas to the mixer, combined with a rockshaft connected with the stem of the said valves, an arm on said shaft provided with anti-friction devices, a rock-lever having arms to co-operate with the anti-friction devices, a spring-plunger controlling the movement of the said rock-lever, a crank attached IOO IIO

to the shaft or pivot of said rock-lever, and a forked arm (3o-operating with said crank and deriving its motion from the holder, substantially as and for the purpose described.

3. In an air and gas mixer, a movable holder, a rock-shaft provided with a depending forked arm and a rod connecting the said holder and rock-shaft, combined with valves arranged in a mixing-chamber and providing for the mixing of air and gas and the admission of the mixed air and gas to the holder, a rock-shaft and a connection between it and the common stem of the said valves, an arm on said valve-actuating shaft, a rock-lever for actuating said arm, a spring-plunger for controlling the movement of said rock-lever, a crank on the rock-lever shaft extended into operative connection With the forked arm, and a dash-pot connected with the arm on the valve-operating shaft, substantially as described.

4. In an air and gas mixer, the holder, a

rock-shaft, and a rod connecting the said rocks shaft and the holder, valves for permitting the mixing of air and gas and admitting the mixed air and gas to the liolder, the valve-actuating shaft, and means, substantially as described, interposed between the rock-shaft and valveactuating shaft, for operating said valve-actuating shaft, and a shaft-locking device consisting of an arm secured on the valve-actuating shaft and provided With a pin, a latch to engage said pin, and a tripping device for said latch, and means controlled by the holder for actuating the tripping device to disengage Ithe latch and permit of the opening` of the valves, substantially as described.

5. In an air and gas mixer, a holder, a rockshaft, and a rod connecting the said rock-shaft and holder, combined with valves for mixing air and gas and admitting the mixed air and gas to the holder, a rock-shaft for actuating the said valves, a rock-lever provided with arms for rocking the said shaft first in one direct-ion, then in another, and a third and laterally-projecting arm on said rock-lever, means, substantially as described, for holding said rock-lever in position and for moving it, and a locking and unlocking device for the valve-operating shaft, comprising a Weighted arm secured on said valve-operating shaft, a latch for engaging it, and a tripping device for disengaging the latch, arranged in the path of movement of the laterally-projecting arm of the rocking lever and actuated by the said laterally-projecting arm as it descends, substantially as described.

6. In an air and gas mixer, a holder, a rockshaft provided with a depending forked arm, and a rod connecting the two, combined with valves for providing for the mixing of the air and gas and for the admission of the mixed air and gas to the holder, and means actuated by the forked arm to open and close the said valves, and-a device for locking the said valves in closed position and for positively unlocking them when desired, comprising a valveshaft, a Weighted arm on said shaft, a latch to engage said arm and prevent it from falling and to retain the valves closed, and a tripping device arranged to be actuated by the valve-moving mechanism to disengage the latch and Weighted arm and permit the Weighted arm to putin motion the valve-moving mechanism, substantially as described.

In testimony whereof I have hereunto set my hand this 25th day of November, A. D.

' EDMUND l\f[EREDITI-I.- WVitnesses:

WM. L. ELKINs, J r., I-I. HERMAN. 

